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United States Patent | 6,166,463 |
Woodward, Jr. | December 26, 2000 |
The present invention resides in a radial air gap machine with a serrated air gap that can minimize external axial forces. This is accomplished by controlling the relationship between the air gap surfaces in the stator and rotor sections. To control the relationship between the stator sections and the rotor section in a vertical motor a bushing with external and internal thread of opposite hand with the internal thread having a steeper helix angle is twisted into a bearing mount and over a motor shaft. Thus, a vertical hollow shaft motor with magnetic balance thrust is adjusted. In axial air gap machines, the magnetic force produced in the air gaps can also be utilized to compensate for axial loads.
Inventors: | Woodward, Jr.; Richard C. (1119 Oakdale, Fullerton, CA 92831) |
Appl. No.: | 198965 |
Filed: | November 25, 1998 |
Current U.S. Class: | 310/67R; 310/190; 310/191; 310/192; 310/195; 310/209 |
Intern'l Class: | H02K 015/00 |
Field of Search: | 310/42,67 R,179,180,190,191,192,209,254,258,259,261,265 29/596,598 |
4341969 | Jul., 1982 | Sievert | 310/154. |
5302876 | Apr., 1994 | Iwamatsu et al. | 310/156. |
5552653 | Sep., 1996 | Nose | 310/263. |
5783890 | Jul., 1998 | Mulgrave | 310/156. |
5834874 | Nov., 1998 | Krueger et al. |